package com.example.a48;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Configuration;
import org.springframework.stereotype.Component;

// 时间解耦例子
@Configuration
public class A48Application_1 {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(A48Application_1.class);
        context.getBean(MyService.class).doBusiness();
        context.close();

        /*
            小结:
                事件监听的两种方式:
                    1. 实现 ApplicationListener 接口
                        根据接口泛型确定事件类型
                    2. @EventListener 标注监听方法
                        根据监听器方法参数确定事件类型
                        解析时机： 在 SmartInitializingSingleton（所有单例初始化完成后），解析每个单例 bean
         */
    }

    static class MyEvent extends ApplicationEvent {

        public MyEvent(Object source) {
            super(source);
        }
    }

    @Component
    static class MyService {

        private static final Logger log = LoggerFactory.getLogger(MyService.class);

        @Autowired
        private ApplicationEventPublisher publisher; // applicationContext

        public void doBusiness() {
            log.debug("主线业务");
            // 主线业务完成后需要做一些支线业务，下面是问题代码
            publisher.publishEvent(new MyEvent("MyService.doBusiness()"));
        }
    }

    @Component
    static class SmsApplicationListener implements ApplicationListener<MyEvent> {

        private static final Logger log = LoggerFactory.getLogger(SmsApplicationListener.class);


        @Override
        public void onApplicationEvent(MyEvent event) {
            log.debug("发送短信");
        }
    }

    @Component
    static class EmailApplicationListener implements ApplicationListener<MyEvent> {

        private static final Logger log = LoggerFactory.getLogger(EmailApplicationListener.class);


        @Override
        public void onApplicationEvent(MyEvent event) {
            log.debug("发送邮件");
        }
    }
}
